Coupler for radioreception



Heu. 25, 1921? E. M, REYNGLDS COUPLER FOR RADIORECEPTE IN1/EN TOR,

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Patented Dec. 25, 1923.

mi* Il'. REYNOLDS, 0F CLEVELANILQHIO.

COUPLEB FOR. RADIOBECEPTION.

Application led lay 15, 1922. Serial I0. 500,930.

To all 'whom t may concern Be it known that I, ERNEST M. REYNOLDS, acitizen of the United States, residing at Cleveland, in the county ofCuyahoga and 6 State 0f Ohio, have invented a certain new 'and usefulImprovement in Couplers for Radioreception, of which the following is afull, clear, and exact description, reference being had to theaccompanyingdrawings. ,I This invention relates to the art of radiosignaling or wireless communication and has especial reference towireless telephoning althou h it is not necessarily confined thereto.'.[he objects of the invention are l the provision of an improved typeof variable inductance b which the receivin circuit can be broug t intoresonance wit the incoming impulses with ease, accuracy, and Qelerit theprovision of a variable resistance aving a sharp and definite actionwhereby incoming wave lengths may be analyzed with accuracy and thoseexcluded which are not desired; the provision of a coupler of greatsimplicity, compactness, convenience and cheapness; while furtherobjects and advantages will become apparent as the description proceeds.

In the drawings accompanying and forming a part of this yapplication Ihave shown one form of apparatus in which my invention may be embodiedtogether with two modes of attaching it in circuit, although it will beunderstood that changes may be made both in construction andinstallation.

A In these drawings Fig. 1 is a diagrammatic layout of a completereceiving set of the crystal detector t'zpe equipped with my imrovedcoupler; i 2 is a diagrammatic ayout of a parta receiving set of theaudion bulb type, showing the mode of einploying my coupler; F' 3 is aperspective view of my coupler ta en from the rear; Fig. 4 is a frontelevation and Fig. 5 a top plan view of the same.

Describing the parts by reference characters, 1 represents an exteriorlyrectangular frame of insulating material having a central cavity 2, and3 represents a primary winding thereon. When made of wood the 5 frame ismerely hollowed out to form a semicircular cavity terminating short ofthe o posite end. of the frame, the two ends o the U thus produced beingconnected by berg 4, 4. of lnsulating material auch as wood or,preferably, vulcanite. Pivoted in these bars is a. semi annular core 5of insulating material, such as wood, on which is wound the Secondarycoil 6. The ends of this core are connected by a member 7 of insulatingmaterial in opposite sides of which are inserted the pivot pins 8, 9,one of which carries the knob 10. The ends of the secondary are attachedto these pivot pins and contact is made by strips 11, 12 carried by thebars 4 and en ging the respective pins. The ends of tlg; primary windingare attached to suitable binding posts 13 and 14.

' The secondary winding thus consists essentially of a lwire helix,curved longitudinally and mounted for rotation about its center ofcurvature. This axis is also transverse to the axis of the primary coilwhich made of oblong rectangular shape with its minimum dimensionparallel to the pivot axisv and its maximum dimension radially hareof,this minimum dimension being onlyk slightly eater than the diameter ofthe helix andir the maximum dimension bei suicient to take both ends ofthe helix at once. It will be understood that by helix I do not confinemyself to a cylindrical coil; indeed I have shown it as flat sided: andby arcuate I mean to include either semicircular as shown or more or lesthan that. I find it most convenient to locate the pivot axissubstantially at one end of the prima coil, but I do not limit myselfexactly thereto. r.

To one of the bars 4 I secure an insulating panel 15 which overhan theprimary wires at a little distance an carries a plurality of contactpoints 16, arranged in an arc of a circle so as to be contacted by thepivoted arm 17 affixed to the knob 18 and connected to the binding post19. The eontact )oints are tapped onto the primary at suita leintervals. As an example of a balance which I have found verysatisfactory, I have employed a primary coil of eighty turns connectedto the contact points at ever eighth turn, in combination with asecondary having one hundred and thirty two turns, the former of No. 22and the latter of No. 24 single cotton covered copper Wire. Of lolcourse I do not limit myself to this number of turns, or size o f wireor shape of parts.

I also show two modes of connecting my n if anfibi@ a, hamm. undmshmdingof the nm tizi-re and mods of ns1 my invention.

intsrp x LL wie

l (rfi n A is can un, nomi-ensei ion si um pi'onces inength andi the@Hows apprnxi- "han zi. sin@ curve to subqha @ns'e and nes fange @ifadjustment of the secondary. As

result of hese fwn conditions the timing;

.not yes'ric myself to ih@ exact designs herei; shown, nor $0 anyspecified ninnbeif o? tin-ns of w'i'e, no1' to the particular cii'cuishisin iHuslriiteiL no1? in :my other way exceph as speciicziiiy :'Qciedin my ciajinis.A

shaving hns cosciihnd my inveninn iii-:hah i Chinn is:

1,. f. "v'zu'nblc imhicance apparatus for radin i'ncsiving seiscomprising n recjajiguhui coil which JEni-nis he pyi'n'mry Winc'ing und:i heinzi coil which forms the seco'nniy, @and helical cnil-being cin-wdhingt-nflinaiy 'to firmate 'forni 'und mounted fol* mint-ion nbnn am unswhich is perpendicular o the :mis mi th@ is named coii :md cnnceniic i@the cmvsnm'e o the helix.

Vninb inductzmce apparatus ni mi lng sets' Cnn'xpisng am oblongecnngnhu.' primary coil and :in sh'mgnfed hciczi secondary @nii which isoni-ved int() aunuzite shsps, ih@ dnmnie* of the helix he ing hiss thanthe smniins; dimension and ihn diuinetni' of its cinfvnur@ being iessthan h@ hngssif dimensioni nf sind primary cnil,

" nia-mns ndjustnhiy pivoti u 'saif sec- Goi upon im axis which is@mulini din'insinn ai the. piiinni'y JM; concis with aha cu'vzitu'rn nfahe snwndzufy. v

s chuziacsm" dess/fiber, inni iectangna* i `om vtmeci in sfi' .mme uponnu Whhh i Consent ic i, iis own curvain the pinne of che frame, n

primary Winding; ocatef. on@ sid@ of .h its :mis neljfenflinuni 'n said,

. anni. a seemingly coi. Wnund @n will,

side the first coil upon an axis which ooin oidos with the axis of thearo doinsd by such secondary coii and intorseois psrpondiculariylihoaxis of said first coil.

7. In a radio coupier,k in combination7 a rectangular primary ooii, andan approxi mately torus-shaped secondary coil adjiistabiy pivotedtherein about the axis 'oi the torna 8 lin a raciio coupler, incombination, a'fiat sided primary ooii, and an approximateiy iioiioalsecondar 1 ooii having its axis curved to conform substantially to thearo oi a oiroie Whose` axis intersects such fiat sidea in a radiocoupier, in combination, a primary coii 1naving fiat sides built up of aplurality of turns of wire and a fiat sided secondary coil pivotedinside said primaryooii upon an axis which is no1-mai zo said iiatsides, said primary coii having a piuraiity of taps arranged atdii'erent points and a connection for said ta s.'

, l0. in a radio coup er, in oombination, a

secondary 'boing a`g'iistabio about an axis `which is normal Said il. Inai'af'iio coupler, in combinaLion f i'ootangnlai primary ooii Comprisinga piu raiity of successivo turns 'of Wire, a piaraiitgx of tapsconnected io saisi turns s igaoei points, a connect-ion for sai 'apsW''iomig'y a greater or smaiier portion of said ooiiy can ba thrown intocircuit, a seconaary ooii siiapoii approximatoiy iie iii sagniont oi atorus adiusaioiy pivord tiiioroin anon axis 'ierponciicuiar to auchfiat, sides.

12. In a radio coupior, :in combination, a Hat sides primar i consistingof a pin raiiiy oi turna a piiiraiity of taps connoctei thereto ai',spacsci points, a conneoiion :for said taps whereby a Greaterori-smaila? p0r-i tion of saidl coii can 'oo thrown intovcirouit and anapproximateiy helical secondary @oii having its axis curved to conformaubstam tiaiiy to the aro of a circle whose axis inter sects saidiat'sides, said secondary coil i)e ing adjastaba aboutjsucii axis.

In testimony whereof, iiaieanto ax siguatiiro.

